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Chapter 16. Auto Scaling

Kubernetes includes the HorizontalPodAutoscaler which allows StatefulSets or Deployments to be automatically scaled up or down based upon specified metrics. The Infinispan CR exposes the .status.scale sub-resource, which enables HorizontalPodAutoscaler resources to target the Infinispan CR.

Before defining a HorizontalPodAutoscaler configuration, consider the types of Data Grid caches that you define. Distributed and Replicated caches have very different scaling requirements, so defining a HorizontalPodAutoscaler for server’s running a combination of these cache types may not be advantageous. For example, defining a HorizontalPodAutoscaler that scales when memory usage reaches a certain percentage will allow overall cache capacity to be increased when defining Distributed caches as cache entries are spread across pods, however it will not work with replicated cache as every pod hosts all cache entries. Conversely, configuring a HorizontalPodAutoscaler based upon CPU usage will be more beneficial for clusters with replicated cache as every pod contains all cache entries and so distributing read requests across additional nodes will allow a greater number of requests to be processed simultaneously.

16.1. Configuring HorizontalPodAutoscaler
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Create a HorizontalPodAutoScaler resource that targets your Infinispan CR.

Procedure

  1. Define a HorizontalPodAutoscaler resource in the same namespace as your Infinispan CR 

    apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: infinispan-auto
spec:
  scaleTargetRef:
    apiVersion: infinispan.org/v1
    kind: Infinispan
    name: example
    1 
    
  minReplicas: 1
  maxReplicas: 10
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 50
    Copy to Clipboard Toggle word wrap
    1
    The name of your Infinispan CR
Note

If using metric resource of type cpu or memory, you must configure request/limits for this resource in your Infinispan CR.

Important

HorizontalPodAutoscaler should be removed when upgrading a Data Grid cluster, as the automatic scaling will cause the upgrade process to enter unexpected state, as the Operator needs to scale the cluster down to 0 pods.

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